Audio Database

The

DIATONE M-A05
38,000yen(around the 1978 time)

Description
 
It is the stereo power amplifier which inherited the technology of M-A01.

Circuit composition has adopted two steps of differential amplification, the current mirrored live, and a whole page direct connection pure complimentary OCL circuit. Moreover, the NPN/PNP silicon transistor with high reliability to which the pair characteristic is good and it was equal is used for a final stage.
Furthermore, the twin transistor which was excellent in the pair characteristic was used for first rank differential, and a pre-driver stage is having differential amplification composition which carried out the assembly of the current mirror circuit, and has realized improvement in the direct-current stability of a circuit, and high gain.

The peak level indicator by five LED per channel is carried.
An indicator circuit carries out logarithm compression of the input signal, and also the about 0.1 second peak hold of detection and the detection signal is carried out. And level detection is carried out by a comparator and LED lights up corresponding to each level.
Moreover, the range change-over switch of x0.01 is prepared, and a level exact also at the time of small volume can be read.

The protection circuit which combined electronic and a relay is built in.
If the direct-current electric potential more than a fixed level arises in a power amplifier output terminal, this protection circuit will operate. Thereby, the output and speaker of amplifier are separated and a speaker is protected from breakage.
Moreover, it is designed operate also as a muting circuit which prevents the unpleasant clicking noise generated at the time of power-source ON-OFF.


Rating of a mode
Form Stereo power amplifier
Output power 50W+50W (8 ohms, 20Hz - 20kHz, THD0.05%)
THD 0.006% (8 ohms, 1W output, 20Hz - 20kHz)
Cross modulation distortion
(70Hz:7kHz=4:1)
0.01% (8 ohms, Output power)
0.005% (8 ohms, 1W output)
Output bandwidth 15Hz - 100kHz (THD 0.1%)
Frequency response 10Hz-100kHz+0 -1 dB
Input sensitivity/impedance 1V/50kohm
Dumping factor 45
Remains noise 200 microvolts
S/N 116dB
Phono Output voltage 0.1mW/W
Power source AC100V, 50Hz/60Hz
Power consumption 125W
Dimensions Width 270x height 140x depth of 243mm
Weight 6kg
Attachment PIN-PIN cord